////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 1996-2021 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Octave is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Octave; see the file COPYING.  If not, see
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////

#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <sys/types.h>

#if defined (HAVE_GRP_H)
#  include <grp.h>
#endif

#include "lo-error.h"
#include "oct-group.h"
#include "str-vec.h"

#define NOT_SUPPORTED(nm)                       \
  nm ": not supported on this system"

OCTAVE_NORETURN static
void
err_invalid (void)
{
  (*current_liboctave_error_handler) ("invalid group object");
}

namespace octave
{
  namespace sys
  {
    std::string
    group::name (void) const
    {
      if (! ok ())
        err_invalid ();

      return m_name;
    }

    std::string
    group::passwd (void) const
    {
      if (! ok ())
        err_invalid ();

      return m_passwd;
    }

    gid_t
    group::gid (void) const
    {
      if (! ok ())
        err_invalid ();

      return m_gid;
    }

    string_vector
    group::mem (void) const
    {
      if (! ok ())
        err_invalid ();

      return m_mem;
    }

    group
    group::getgrent (void)
    {
      std::string msg;
      return getgrent (msg);
    }

    group
    group::getgrent (std::string& msg)
    {
#if defined (HAVE_GETGRENT)
      msg = "";
      return group (::getgrent (), msg);
#else
      msg = NOT_SUPPORTED ("getgrent");
      return group ();
#endif
    }

    group
    group::getgrgid (gid_t gid)
    {
      std::string msg;
      return getgrgid (gid, msg);
    }

    group
    group::getgrgid (gid_t gid, std::string& msg)
    {
#if defined (HAVE_GETGRGID)
      msg = "";
      return group (::getgrgid (gid), msg);
#else
      octave_unused_parameter (gid);

      msg = NOT_SUPPORTED ("getgruid");
      return group ();
#endif
    }

    group
    group::getgrnam (const std::string& nm)
    {
      std::string msg;
      return getgrnam (nm, msg);
    }

    group
    group::getgrnam (const std::string& nm, std::string& msg)
    {
#if defined (HAVE_GETGRNAM)
      msg = "";
      return group (::getgrnam (nm.c_str ()), msg);
#else
      octave_unused_parameter (nm);

      msg = NOT_SUPPORTED ("getgrnam");
      return group ();
#endif
    }

    int
    group::setgrent (void)
    {
      std::string msg;
      return setgrent (msg);
    }

    int
    group::setgrent (std::string& msg)
    {
#if defined (HAVE_SETGRENT)
      msg = "";
      ::setgrent ();
      return 0;
#else
      msg = NOT_SUPPORTED ("setgrent");
      return -1;
#endif
    }

    int
    group::endgrent (void)
    {
      std::string msg;
      return endgrent (msg);
    }

    int
    group::endgrent (std::string& msg)
    {
#if defined (HAVE_ENDGRENT)
      msg = "";
      ::endgrent ();
      return 0;
#else
      msg = NOT_SUPPORTED ("endgrent");
      return -1;
#endif
    }

    group::group (void *p, std::string& msg)
      : m_name (), m_passwd (), m_gid (0), m_mem (), m_valid (false)
    {
#if defined (HAVE_GRP_H)
      msg = "";

      if (p)
        {
          struct ::group *gr = static_cast<struct ::group *> (p);

          m_name = gr->gr_name;

#if defined (HAVE_GR_PASSWD)
          m_passwd = gr->gr_passwd;
#endif

          m_gid = gr->gr_gid;

          // FIXME: Maybe there should be a string_vector constructor
          //        that takes a NUL terminated list of C strings?

          const char * const *tmp = gr->gr_mem;

          int k = 0;
          while (*tmp++)
            k++;

          if (k > 0)
            {
              tmp = gr->gr_mem;

              m_mem.resize (k);

              for (int i = 0; i < k; i++)
                m_mem[i] = tmp[i];
            }

          m_valid = true;
        }
#else
      octave_unused_parameter (p);

      msg = NOT_SUPPORTED ("group functions");
#endif
    }
  }
}
